/**
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements.  See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership.  The ASF licenses this file to you under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with the License.  You may obtain
 * a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package org.apache.zookeeper.graph.servlets;

import java.io.File;
import java.io.IOException;
import java.io.FileNotFoundException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.JSONValue;

import java.util.Arrays;
import java.util.Comparator;

public class Fs extends JsonServlet {
    String handleRequest(JsonRequest request) throws Exception {
        String output = "";
        JSONArray filelist = new JSONArray();

        File base = new File(request.getString("path", "/"));
        if (!base.exists() || !base.isDirectory()) {
            throw new FileNotFoundException("Couldn't find [" + request + "]");
        }
        File[] files = base.listFiles();
        Arrays.sort(files, new Comparator<File>() {
            public int compare(File o1, File o2) {
                if (o1.isDirectory() != o2.isDirectory()) {
                    if (o1.isDirectory()) {
                        return -1;
                    } else {
                        return 1;
                    }
                }
                return o1.getName().compareToIgnoreCase(o2.getName());
            }
        });

        for (File f : files) {
            JSONObject o = new JSONObject();
            o.put("file", f.getName());
            o.put("type", f.isDirectory() ? "D" : "F");
            o.put("path", f.getCanonicalPath());
            filelist.add(o);
        }
        return JSONValue.toJSONString(filelist);
    }
}
